What's the difference between these two parts?

[marsgorski]

I need to buy a clamping plate for my door lock cylinder (coupe, driver's side) but I'm seeing two different ones and they both seem to fit my car (325e produced in 11/86). One of them is "heated" and comes with an electrical wire attached to it (part # 51211375188) and the other one has no wire (51211838035). I'm very confused about whether I could use either/or, and what difference it would make, or if I absolutely need the right one. Anyone familiar?

[325isman]

I think I may have the non wire one.